noun
earthen kiln
A kiln made of earth or clay, used for firing pottery or other materials.
この地域では、伝統的な土窯で焼き物を作っています。
In this region, they make pottery using traditional earthen kilns.
窯 is the general term for a kiln or oven, while 土窯 specifically refers to one made of earth.
Compound of 土 (do, 'earth') and 窯 (kama, 'kiln'). The reading どがま is a straightforward combination of the on'yomi of 土 and the kun'yomi of 窯.