It's difficult not to fall in love with the sea when in Northern Hokkaido. It is unpolluted and of a beautiful deep blue.
The crashing waves and spray are therapeutic. Look out for the seaweed (kunbu) tossing about the waves.
No one said you couldn't trek along a biking path. However, be prepared to make a U-turn along the path as it does not exit out into any footpaths or trekking routes.
The path I took from Himenuma towards the port was on elevated grounds which had great views of the sea, mountains, forests and wilflowers.
The lake is about 5km from Oshidomari port and takes about 75 minutes to reach on foot. The track along the sea is relatively easy until I had to ascend a steep slope which took my breath away. Literally and metaphorically.
The lake's name is derived from the type of salmon released into it. At the lake, flocks of gulls await your arrival whilst avid photographs await passing clouds to get the perfect shot of lake, gulls and mountain.