莎湖陆棚（英语：Sahul Shelf；英语发音：/səˈhuːl/），又译萨赫尔陆棚或萨赫勒陆棚，是澳大利亚洲的延伸，位处于澳大利亚大陆海岸以外，新几内亚及其附属岛屿是这个陆棚的一部分。

这核心周围，本地区的其馀部分则是陆棚外缘一系列连续褶皱运动逐步形成的，更强烈和广泛的造山幕发生于中生代时期。位于许多板块的会合处，故而地质运动颇为剧烈，火山活动相当的活跃，整个地区各处散布着二百多座火山，其中约七十座在印度尼西亚，过去一百五十年间曾喷发过。在四个主要冰期，当时海平面比现在低过一百公尺（300呎），巽他与莎湖两陆棚露出海面，陆棚地面大河奔流，当时的动物和古人类可藉陆桥穿越此处。当一万七千年前冰盖融解后，巽他陆棚一部分被淹没，山脉和较高的地方成了浅海浸入的岛屿或半岛。

The Sahul Shelf /səˈhuːl/ is part of the continental shelf of the Australian continent and lies off the coast of mainland Australia. The Sahul Shelf proper stretches northwest from Australia much of the way under the Timor Sea towards Timor, ending where the seabed begins descending into the Timor Trough. Another part of the Sahul Shelf is known also as the Arafura Shelf and runs all the way from the northern coast of Australia under the Arafura Sea to New Guinea. The Aru Islands rise from the Arafura Shelf. The Sahul Shelf is sometimes taken to also include the Rowley Shelf which runs out under the Indian Ocean from the northwest coast of Australia as far south as North West Cape.