dhalai river

soil geology sand rock river wetland shore sea water badlands coast wadi landscape mudflat stream wilderness terrain reservoir waterway dhalai bangladesh-india border losing navigability man-made environmental pollution background beach beautiful beauty blue boat change clement clements mountain climate coast concept cost desert protection feeling forest green hidden lake nature trail iceland island lake land landscape life logging mild mountain blue sky mountains natural natural resources nature outdoor plant reflection reservoir river rocky sand snow covered stone travel tropical view water weather wild