Mainland rhymes with:
finland, inland, rhineland, sunland, badland, bergland, businessland, computerland, cropland, crossland, discland, disneyland, dixieland, dreamland, fairyland, fantasyland, farmland, fatherland, finland, flatland, gondwanaland, grassland, heartland, hinterland, homeland, inland, lapland, lowland, marshland, midland, moorland, motherland, musicland, northland, nuland, outland, overland, parkland, queensland, rhineland, sealand, shadowland, somaliland, southland, spiceland, sunland, thailand, timberland, wasteland, wetland, wonderland, woodland
Mainland sounds like:
malamud, malamute, maland, malinda, malinde, mayland, melamed, meland, melantha, melendy, melinda, melland, milholland, millionth, moland, molenda, mulholland