Simplify the following text for a Grade 13 native English-speaking person.
Original: Estuaries and tidal flats are populated with varieties of mangroves ( 39 of the 47 Northern Territory species of mangrove occur in Kakadu ) that are important for stabilising the coastline .
Simplified: Estuaries and tidal flats are populated with varieties of mangroves , in fact 39 of the 47 Northern Territory species of mangrove are found in Kakadu .