Mearc-wæd

According to the Old English Dictionary:

es;

mearc-wæd

n. Boundary-water, the water by the shore :-- Wlanc monig on stæþe stódon stundum wrǽcon ofer mearcwaðu and ðá gehlódon hildesercum wǽghengestas many a proud one stood on the shore; now and again they pressed over the border-floods, and then laded the wave-steeds with their war-shirts (but cf. mearc-pæð), Elen. Kmbl. 465; El. 233. mearc-wæd,mearc-waed