creek, inlet, bay
江 centers on a body of water that is a smaller offshoot of a larger one: a creek, inlet, or bay. It describes a water feature that branches inward from a river or sea.
江 combines the water radical 氵 with 工, which likely contributes the sound. The character originally referred to a specific river (the Yangtze) and later broadened to mean a creek or inlet.
The water radical 氵 beside 工 suggests a constructed waterway: imagine a man-made channel (工 as work) that branches off a river, forming a small creek or inlet.
For コウ, picture a calm cove (a small bay) where the water is still: cove -> コウ, and the inlet is a peaceful cove off the main river.
Edo (shogunate capital; former name of Tokyo); Yedo
inlet; bay
canal
Ōmi (former province located in present-day Shiga Prefecture)
Matsue (city in Shimane)
inlet; cove; creek; bay
(on the) bank of a large river
riverbank (esp. the Yangtze River)
Edo Castle (residence of the Shogun during the Edo period, now the site of the Tokyo Imperial Palace)
Yangtze River (China); Changjiang River
Tokyo style
Yangtze River (China)
Tōtōmi (former province located in the west of present-day Shizuoka Prefecture)
village along a (large) river
estuary
saltwater crocodile (Crocodylus porosus); estuarine crocodile
Ōedo Line
Little Edo; town or neighbourhood with an old townscape reminiscent of Edo
Koedo
baiji (Lipotes vexillifer); Chinese river dolphin; Yangtze dolphin