Where is the source of his information?

We had a picnic on the riverbed.

I made a new seedbed in the garden.

My bed is very comfortable.

This wasanbon is a traditional Japanese sweet and is very sweet.

The Kuroshio is one of Japan's ocean currents, carrying warm water.

Kurosawa is my best friend.

He was wearing a sable fur.

Messor aciculatus, also known as Kuro-naga-ari, is a species of ant widely distributed throughout Japan.

I saw a common scoter in the park pond.