The swales are the depressions between the ridges. Waters from the Nile filled depressions like the Fayum Depression. Nests are shallow dirt depressions engulfed with woody vegetation. The hummocks alternate with shallow wet depressions or flarks. There are places that are closed depressions with river valleys leading into them. The majority of these lavas erupted or flowed into the depressions associated with impact basins. She experienced severe fears and frequent depressions. Cols are saddle-shaped depressions in the ridge between cirques. Representative landforms include depressions and pans, Yardangs, inverted topography and ventifacts. The Mark is defined by two uplands and two depressions. The country is also affected by tropical depressions, tropical storms and typhoons. Rainfall tends to be associated with Atlantic depressions or with convection. This is a particular problem for receivers located in depressions and valleys. This is a list of economic crises and depressions. The season featured twenty tropical depressions, eighteen of which became tropical or subtropical storms.