Rig Veda VI.61.12 says
Seven-sistered, sprung from threefold source, the Five Tribes' prosperer, she must be Invoked in every deed of might.
At another mantra in Rig Veda, seven rivers - सप्त सिन्धून, were mentioned (RV II.12.3), as being freed by Indra.
My question is, does the word सप्त सिन्धून indicate, seven branches of Sindhu river or seven separate rivers? And, is Sarswati included in सप्त सिन्धून - seven rivers?