Vishakha sakhi expands herself as the Yamuna River and serves Sri Krishna. Whenever Krishna sees Vishakha He immediately thinks of Sri Radha; whenever Sri Radha sees the syama (dark blue) waters of the Yamuna River She immediately thinks of Krishna.
vizaakhorasi yaa vishnor yasyaam vishnur-jalaatamani j
nityam nimajjati prItyaataam shaureem yamunaam stumaha
Lord Vishnu daily immerses Himself and plays with great pleasure and affection in the water of the Yamuna, the liquid form of Vishakhadevi. I offer prayers to Yamunadevi, the daughter of the sun god Surya.
Commentary of Sri Baladeva Vidyabhushana:
Vishakha yamuna-vapur iti vichaarena
yamuna-stutyaa tat stutir iti vidybhushanah
Sri Vishakha is considered as the vapu (embodiment) of Yamuna. Therefore, by offering prayers to Yamuna one is also offering prayers to Vishakha devi.
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