Mǽr-heg

According to the Old English Dictionary:

es;

mǽr-heg

m. A boundary (?) hedge :-- Ondlong ðære burnan óþ hit cymeþ tó ðæm mǽrhege; ondlong ðæs mǽres heges ðæt hit cymeþ up on ða dúne. Cod. Dip. Kmbl. iii. 32, 29. Cf. gemǽr-haga. mær-heg