The Book 17: Mahaprasthanika Parva Section I mentions the Pandavs visiting a red-sea. This is where Arjun returned his divine bow and arrows to the Lord of the Ocean:
Setting themselves on Yoga, those high-souled ones, resolved to observe the religion of Renunciation, traversed through various countries and reached diverse rivers and seas. Yudhishthira, proceeded first. Behind him was Bhima; next walked Arjuna; after him were the twins in the order of their birth; behind them all, O foremost one of Bharata’s race, proceeded Draupadi, that first of women, possessed of great beauty, of dark complexion, and endued with eyes resembling lotus petals. While the Pandavas set out for the forest, a dog followed them.
"Proceeding on, those heroes reached the sea of red waters. Dhananjaya had not cast off his celestial bow Gandiva, nor his couple of inexhaustible quivers, actuated, O king, by the cupidity that attaches one to things of great value. The Pandavas there beheld the deity of fire standing before them like a hill. Closing their way, the god stood there in his embodied form. The deity of seven flames then addressed the Pandavas, saying, ‘Ye heroic sons of Pandu, know me for the deity of fire. O mighty-armed Yudhishthira, O Bhimasena that art a scorcher of foes, O Arjuna, and ye twins of great courage, listen to what I say! Ye foremost ones of Kuru’s race, I am the god of fire. The forest of Khandava was burnt by me, through the puissance of Arjuna and of Narayana himself. Let your brother Phalguna proceed to the woods after casting off Gandiva, that high weapon. He has no longer any need of it..’
My question is Is it possible to identify this sea of red waters?