Syrtis is a term that can have multiple meanings depending on the context. It is often used to refer to an area on Mars, known as the Syrtis Major Planum, that has long been a topic of interest for scientists due to its geological features. However, Syrtis can also be used to describe dangerous sandbars or reefs in the Mediterranean Sea. If you are searching for synonyms for Syrtis, you could try using words like "sandbank," "shoal," "reef," or "bar." In the context of Mars, you may also want to consider terms like "plateau," "region," or "feature".