also: タマリせき
noun
In sumo, the seats closest to the ring, traditionally on tatami cushions. Also called 砂かぶり.
溜まり席は砂かぶりとも呼ばれ、大相撲で最も迫力のある席です。
The ringside seats, also called suna-kaburi, are the most thrilling seats in grand sumo.
From 溜まり (gathering place, from 溜まる 'to gather') + 席 (seat). The term originally referred to the area where sumo wrestlers wait, and later came to denote the closest spectator seats.