Patent ID: 8830445

Claim:
A lithographic projection apparatus comprising: a projection system configured to project a patterned beam of radiation onto a target portion of a substrate; a substrate table having an upper surface and a mount area that is provided in an opening formed on the upper surface, the substrate table being configured to hold the substrate in the opening such that a gap is formed between an upper surface of the substrate and the upper surface of the substrate table and such that the upper surface of the substrate and the upper surface of the substrate table are substantially coplanar; and a liquid supply system configured to provide a liquid to a space between the projection system and the substrate, the liquid supply system including a liquid supply member that encircles a final optical element of the projection system and includes a downward-facing surface that faces the upper surface of the substrate held by the substrate table, the downward-facing surface including a liquid supply inlet that introduces the liquid to a gap below the downward-facing surface, wherein the substrate table is arranged to maintain at least part of a liquid immersion region, which is formed below the projection system with the liquid, by use of the upper surface of the substrate table when the at least part of the liquid immersion region is outward of the upper surface of the substrate, which is held in the opening.