A tributary valley that joins a main valley where the latter has been deepened, usually by glacial erosion, resulting in a steep drop from the floor of the tributary valley to the floor of the main valley
tabanı ana vadiye oranla oldukça yüksekte olan yan vadi
الواصلة
ta·ba·nı a·na va·di·ye o·ran·la ol·duk·ça yük·sek·te o·lan yan va·di