pothole, mudslide, drainage ditch, fissure, manhole, retaining wall, rockslide, culvert, crater, landslip, trench, roadbed, seepage, dike, creek, berm, snowshed, streambed, chuckholes, roadway, subsidence, flooding, ravine, hole, swale, septic tank, creek bed, manhole cover, mud puddle, overpass, reservoir, soakaway, wreck, embankment, ruts, seawall, backhoe, puddle, boulders, hardpan, cenote, drainpipe, gullies, seiche, flood plain, graben, spillway, cavern, frost heave, chasm, hillside, revetment, waterline, caliche, excavation, fire hydrant, waterspout, canal, windstorm, riverbed, crevice, leak, lake, traffic jam, mudflow, drainage, rainstorm, landslides, arroyo, pond, cypress tree, shoaling, cesspool, funnel cloud, intersection, rupture, gulch, flash flood, debris, sewer, floodwaters, levee, rock outcrop, cracks, hydrant, floodplain, sinkage, gusher, subgrade, geyser, eluvial, driveway, ditches, drain, swales, digging, crevasse, mudhole, accident, canyon, oak tree, floodwater, amphitheater, lagoon, chimney, ditch, landslide, moat, whirlpool, bog, caldera, cauldrons, dune, granary

depression, natural depression

swallow hole