Mahi

http://6tri.blogspot.com/search/label/Indradyumna

It is stated that the waters of Mahi comprise (the essence of) waters of all the twenty thousand six hundred holy Tirthas and rivers, 1 viz. Varanasi, Kuruksetra, Ganga, Reva, Sarasvati, Tapi, Payosrti, Nirvindhya, Candrabhaga, Iravati, Kaveri, Sarayu, Gandaki, Naimisa, Gaya, Godavari, Arutja, Varuna—these and hundreds of other holy rivers on the earth. 

https://www.google.com/search?q=Mahi+river

 It is said that according to the words (i.e. opinion) of Kumara (i.e. Skanda), the fruit one obtains by taking baths in all the Tirthas on the earth is gained by taking a holy dip in (the confluence of) Mahi and the sea.

https://www.google.com/search?q=Mahisagar+Sangam

I spoke to Bhrgu:  

20-22a. “Let it be heard. 1 shall tell the purpose for which  l have come here. The entire ocean-girt earth has been roamed over by me. For the sake of gifting land-grants to Brahmanas I am seeking at every step beautiful and pleasing pieces of land,  holy and devoid of defects, connected with holy Tirthas as well. But 1 do not see anything at all.” 

Bhrgu said: 

22b-24. O sinless one, I too had wandered before. The entire ocean-girt earth had been seen then by me. My intention had been (to find a suitable place) for settling Brahmarias. There is a splendid holy river named MahJ. 1 It consists of all Tirthas. (It is identical with all Tirthas.) It is divine and charming, gentle and destructive of all great sins. There is no doubt about it that the earth itself is present there in the form of the river. 

25. Whatever holy spots and sacred bathing places there are, both visible and invisible, all of them reside in the waters of  that river Mahi, O Narada. 

26. Where that great river of sacred waters joins the ocean, O celestial sage, there has arisen (a holy Tirtha called) Mahl-Sagara-Sahgama (‘the Confluence of Mahi and Sea’). 

https://freeglobaluniversity.blogspot.com/search/label/Skanda