Castel (Guernésiais: Lé Casté; French: Sainte-Marie-du-Câtel) is the largest parish in Guernsey in terms of area. The Parish has clear evidence of changes in ancient sea-levels, with trunks of an oak forest visible on Vazon beach at very low tide and at 8m above sea level an ancient beach. The old Guernésiais nickname for people from Castel was ânes pur sàng. The parish plays host to both Le Viaër Marchi and the North Show which includes the Battle of Flowers annually. It also produces a regular magazine called Castel Matters. The postal code for street addresses in this parish begins with GY5.