wadi (n.)
- abysm
- abyss
- aqueduct
- arroyo
- beck
- bed
- bottom
- bottoms
- bourn
- branch
- breach
- break
- brook
- brooklet
- burn
- canal
- canyon
- cavity
- channel
- chap
- chasm
- check
- chimney
- chink
- cleft
- col
- crack
- cranny
- creek
- crevasse
- crevice
- crick
- culvert
- cut
- cwm
- dale
- defile
- dell
- dike
- dingle
- ditch
- draw
- excavation
- fault
- fissure
- flaw
- flume
- fracture
- freshet
- furrow
- gap
- gape
- gash
- gill
- glen
- gorge
- groove
- grove
- gulch
- gulf
- gully
- headrace
- hole
- incision
- joint
- kill
- leak
- midstream
- moat
- notch
- nullah
- opening
- pass
- passage
- race
- ravine
- rent
- rift
- rime
- river
- rivulet
- run
- rundle
- runnel
- rupture
- scissure
- seam
- slit
- slot
- sluice
- spillway
- split
- stream
- streamlet
- swash
- tailrace
- trench
- trough
- vale
- valley
- void
- watercourse
- waterway
- waterworks