noun
the farthest ends; the furthest reaches
Often used in a poetic or literary sense to refer to the most remote or extreme place, such as the edge of the world or the end of a journey.
彼は世界の最果てを目指して旅立った。
He set out on a journey aiming for the farthest ends of the world.
この町はまるで最果てのように感じられる。
This town feels as if it's at the edge of the world.
Compound of 最 (sai, 'most') and 果て (hate, 'end, limit'). The reading さいはて is a regular combination of the on'yomi of 最 and the kun'yomi of 果て.