Since the early 1970s, the proliferation of World Heritage (WH) properties across the globe has strengthened the conservation and protection of natural and cultural heritage. As the listing of the 1000th WH property approaches, it is timely to review how the ideals of protection expressed in international agreements such as the World Heritage Convention transfer to land use planning regimes at the local, property-specific, level. Conservation, in practice, sees the enactment of rules that become spatially expressed, oftentimes, in the form of zoned planning overlays. Buffer zones, in particular, are a favoured tool in WH site management to protect the core property, yet there is a lack of data about the evolution, use and effectiveness of this approach. This paper considers the core-and-buffer-zone principle in the protection of the WH property at Angkor, Cambodia. Reflecting on the circumstances of Angkor’s listing, this paper argues, first, that while the core-and-buffer-zones approach remains a useful tool in land use planning, far more research and reflection should be required before zone design is determined and applied; and second, that diverse site circumstances dictate that a standardised core-and-buffering approach may not always be the best solution.