No, Chandala is an outcaste varna born from a Pratiloma marriage of Brahmin woman and Shudra man and live within Aryavarta(India).
Examples of Anuloma and Pratiloma marriages?
Mahabharata 13: Anusasana Parva SECTION XLVIII
The Brahmana may take four wives, one from each of the four orders. In
two of them (viz., the wife taken from his own order and that taken
from the one next below), he takes birth himself (the children
begotten upon them being regarded as invested with the same status as
his own). Those sons, however, that are begotten by him on the two
spouses that belong to the next two orders (viz., Vaisya and Sudra),
are inferior, their status being determined not by that of their
father but by that of their mothers. The son that is begotten by a
Brahmana upon a Sudra wife is called Parasara, implying one born of a
corpse, for the Sudra woman's body is as inauspicious as a corpse. He
should serve the persons of his (father's) race. Indeed, it is not
proper for him to give up the duty of service that has been laid down
for him. Adopting all means in his power, he should uphold the burden
of his family. Even if he happens to be elder in age, he should still
dutifully serve the other children of his father who may be younger to
him in years, and bestow upon them whatever he may succeed in earning.
A Kshatriya may take three wives. In two of them (viz., the one taken
from his own order and the other that is taken from the order
immediately below), he takes birth himself (so that those children are
invested with the status of his own order). His third wife being of
the Sudra order is regarded as very inferior. The son that he begets
upon her comes to be called as an Ugra. The Vaisya may take two
spouses. In both of them (viz., the one taken from his own order, and
the other from the lowest of the four pure orders), he takes birth
himself (so that those children become invested with the status of his
own order). The Sudra can take only one wife, viz., she that is taken
from his own order. The son begotten by him upon her becomes a Sudra.
A son that takes birth under circumstances other than those mentioned
above, comes to be looked upon as a very inferior one If a person of a
lower order begets a son upon a woman of a superior order, such a son
is regarded as outside the pale of the four pure orders. Indeed, such
a son becomes on object of censure with the four principal orders. If
a Kshatriya begets a son upon a Brahmana woman, such a son, without
being included in any of the four pure orders, comes to be regarded as
a Suta The duties of a Suta are all connected with the reciting of
eulogies and encomiums of kings and other great men. The son begotten
by a Vaisya upon a woman of the Brahmana order comes to be regarded as
a Vaidehaka. The duties assigned to him are the charge of bars and
bolts for protecting the privacy of women of respectable households.
Such sons have no cleansing rites laid down for them. If a Sudra man
unites with a woman belonging to the foremost of the four orders i.e
Brahmin woman, the son that is begotten is called a Chandala. Endued
with a fierce disposition, he must live in the outskirts of cities and
towns and the duty assigned to him is that of the public executioner.
Such sons are always regarded as wretches of their race. These, O
foremost of intelligent persons, are the offspring of intermixed
orders. The son begotten by a Vaisya upon a Kshatriya woman becomes a
Vandi or Magadha. The duties assigned to him are eloquent recitations
of praise. The son begotten through transgression, by a Sudra upon a
Kshatriya women, becomes a Nishada and the duties assigned to him have
reference to the catching of fish. If a Sudra happens to have
intercourse with a Vaisya woman, the son begotten upon her comes to be
called Ayogava. The duty assigned to such a person are those of a
Takshan (carpenter).
As an example of this it may be said that a Sudra begets upon a woman
belonging to the most superior order a son that is outside the pale of
the four orders (for such a son comes to be regarded as a Chandala who
is much inferior). The son that is outside the pale of the four orders
by uniting with women belonging to the four principal orders, begets
offspring that are further degraded in point of status. From those
outside the pale of the four orders and those again that are further
outside that pale, children multiply in consequence of the union of
persons with women of classes superior to their own. In this way, from
persons of inferior status classes spring up, altogether fifteen in
number, that are equally low or still lower in status. It is only from
sexual union of women with persons who should not have such union with
them that mixed classes spring up. Among the classes that are thus
outside the pale of the four principal or pure orders, children are
begotten upon women belonging to the class called Sairindhri by men of
the class called Magadha. The occupation of such offspring is the
adornment of the bodies of kinds and others. They are well-acquainted
with the preparation of unguents, the making of wreaths, and the
manufacture of articles used for the decoration of the person. Though
free by the status that attaches to them by birth, they should yet
lead a life of service. From the union of Magadhas of a certain class
with women of the caste called Sairindhri, there springs up another
caste called Ayogava. Their occupation consists in the making of nets
(for catching fish and fowl and animals of the chase). Vaidehas, by
uniting themselves with women of the Sairindhri caste, beget children
called Maireyakas whose occupation consists in the manufacture of
wines and spirits. From the Nishadas spring a caste called Madgura and
another known by the name of Dasas whose occupation consists in plying
boats. From the Chandala springs a race called Swapaka whose
occupation consists in keeping guard over the dead. The women of the
Magadhi caste, by union with these four castes of wicked dispositions
produce four others who live by practising deceit. These are Mansa,
Swadukara, Kshaudra, and Saugandha. From the Vaideha springs up a
cruel and sinful caste that lives by practising deception. From the
Nishadas again springs up the Madranabha caste whose members are seen
to ride on cars drawn by asses. From the Chandalas springs up the
caste called Pukkasa whose members are seen to eat the flesh of asses,
horses and elephants. These cover themselves with the garments
obtained by stripping human corpses. They are again seen to eat from
broken earthenware. These three castes of very low status are born of
women of the Ayogava caste (by fathers taken from different castes).
The caste called Kshudra springs from the Vaidehaka. The caste called
Andhra which takes up its residence in the outskirts of towns and
cities, also springs up (from the Vaidehakas). Then again the
Charmakara, uniting himself with a woman of Nishada caste, begets the
class called Karavara. From the Chandala again springs up the caste
known by the name of Pandusaupaka whose occupation consists in making
baskets and other things with cleft bamboos. From the union of the
Nishada with a woman of the Vaidehi caste springs one who is called by
the name of Ahindaka. The Chandala begets upon a Saupaka woman, a son
that does not differ from the Chandala in status or occupation. A
Nishada woman, by union with a Chandala, brings forth a son who lives
in the outskirts of villages and towns. Indeed, the members of such a
caste live in crematoria and are regarded by the very lowest orders as
incapable of being numbered among them.
Thus to these mixed castes
spring up from improper and sinful union of fathers and mothers
belonging to different castes. Whether they live in concealment or
openly, they should be known by their occupations. The duties have
been laid down in the scriptures for only the four principal orders.
As regards the others the scriptures are entirely silent. Among all
the orders, the members of those castes that have no duties assigned
to them by the scriptures, need have no fears as to what they do (to
earn their livelihood). Persons unaccustomed to the performance or for
whom sacrifices have not been laid down, and who are deprived of the
company and the instructions of the righteous whether numbered among
the four principal orders or out of their pale, by uniting themselves
with women of other castes, led not by considerations of righteousness
but by uncontrolled lust, cause numerous mixed castes to come into
existence whose occupations and abodes depend on the circumstances
connected with the irregular unions to which they owe their origin.
Whether a man happens to be possessed of learning or not, lust and
wrath are natural attributes of humanity in this world. Women,
therefore, may always be seen to drag men into the wrong path. This
natural disposition of women is such that man's contact with her is
productive of misery to him. Hence, men possessed of wisdom do not
suffer themselves to be excessively attached to women.'
Mlecchas are the races that sprung up from the war of Vashista-Vishwamitra over the Kamdhenu cow and live outside Aryavarta(outside India)
Mahabharata links the origin of Hunas with sage Vasishta. Viswamitra,
a king in the Ikshwaku clan, attacked the cow of Vasishta. Then many
armies emerged for the protection of that cow and they attacked the
armies of Viswamitra. Cow symbolizes land, in ancient Indian
scriptures. Thus this war was fought with the tribes allied with
Vasishta for their own land. Other tribes that were mentioned along
with the Hunas in this incident were Sakas, Yavanas, Savaras, Savaras,
Paundras and Kiratas, and the barbarous tribes of Khasas, Chivukas,
Pulindas, Chinas and numerous other Mlechchhas.
From the list it seems that it is a compiled list of tribes formerly
unknown to the Vedic Kingdoms. The above story of Mahabharata differs
somewhat from the Shavala cow story of Valmiki Ramayana. According to
Valmiki Ramayana which is older than the Mahabharata, the list of the
tribes connected with Vasishtha-Vishwamitra war over the possession of
Shavala/Kamdhenu cow includes the Kambojas, Pahlavas, Yavanas, Shakas,
Mlecchas, Haritas, Kiratas etc [Ramayana, Bala Kanda, 55.1-4].
Ramayana list being older is often taken more authentic of the two
lists.
Medieval Hindu literature, such as that of Chaitanya Mahaprabhu, also
uses the term to refer to those of larger groups of other religions,
especially Muslims