Montserrat – Montserrat's capital is Plymouth

(Pronounced mont-suh-rat and plim-uhth)

Note: A plimsol line is a marking on a ship's side showing the limit of legal submersion when loaded with cargo under various sea conditions. 

To remember the capital of Montserrat, use the following mnemonic:

The monster is a giant rat (Montserrat) with a plimsol line alongside its mouth (Plymouth).