Westereendersk is a local variety of Wood Frisian and is spoken in De Westereen, Zwagerbosch and Twijzelerheide.
This sound change from /ai/ and sometimes /ɪ/ to /eː/ brings us some striking similarities with English in spoken or written texts as most differences to standard West Frisian also concern differences to English.
This phenomenon can also be found back in other parts of the Frisian Woods.
When the municipality of Dantumadiel chose for West Frisian names as official topographical names it was decided to replace the Dutch name Zwaagwesteinde by De Westereen instead of De Westerein.
Towns like Zwagerbosch and Twijzelerheide also speak "Westereender Frisian".