This is a nice run in the southwestern part of Yamaguchi. Ishin Centennial Memorial Park is a major athletic centre, home to rugby & soccer stadiums, tennis courts, and two running tracks. A loop around the park’s pedestrian paths and roads is ~3.5 km. Enjoy a few laps around the track at Ishin Centennial Memorial Park Athletic Field.

Yoshiki River. Google Street View

For a longer run, the Yoshiki River is adjacent to the park. There’s a small road/path along the narrow river. Head north for ~1.2 km to Highway 9, or south for 1 km Bando Park (so, ~2.2 km of paths along the river). Combining Centennial Park and the river paths can yield an 8-9 km run!