The Egotagawa 江古田川（えごたがわ） is a short tributary of the Kandagawa (I’ve also seen it spelled Ekodagawa and Ekotagawa). In addition, the river also goes by the name 中新井川 (Nakaarai-gawa / Nakaarai river).
Egotagawa river details:
- River system: Arakawa
- Visible length: ~ 1.6 km
- Source: 学田公園 Gakuden park (map)
- End: confluence with the Myoshoji river (map)
- Note: the river travels another 1.6 km underground from its source, before surfacing here: map; the underground section is a road with a median-strip of greenery; it is called Egotagawa Green Road 江古田川緑道
In the map below, the underground porion of the river is in the west; the visible portion of the river is to the east: