I found two models of artistic manhole covers in Chiba, and both are featuring the three symbols of the Chiba city and prefecture, the hojiro bird (meadow buntings, the most beloved birds in the area), the keyaki tree (Japanese Zelkova), and the lotus flower.

Chiba Manhole Cover, Chiba

EXIF Info:

Yesterday’s Japan Photo: Kobe Tetsujin 28