Kofu Basin is surrounded by mountains.
But the basin is flat,because stone and sand flowed from surrounding mountain accumulated on the bottom of the pool.Kofu city,Yamanashi pref.
The rice field is on the river terrace of Tenryu river.The easy slope seen at the center of the photo is alluvial fan. This fan is made of stone and sand that flowed from mountain(Central Japan Alps),Komagane city,Nagano pref.