Plymouth Sound (EN) / Morlynn Aberplymm (KW)

Notes: 
Morlynn = a major estuary into which others flow.
Elements: 

morlynn

Meaning: 
lagoon

aber

Meaning: 
mouth (of river)

Plymm

Meaning: 
river name
Elements notes: 
<morlynn> rode/road + <aber> river mouth + <Plymm> river name