Sant Llorenç des Cardassar was the tragic scene of flash floods on the night of October 9th, 2018, in which 13 people died. Some 400 troops of the Spanish Army, Civil Guard, firemen, local police and Civil Protection were mobilized to help trapped people and locate those missing. More than 200 people slept in shelters that were set up for those affected. 
Sant Llorenç is 34 mi (55 km) east of Palma de Mallorca, the island's capital. The municipality, on the eastern coast of the island of Mallorca, adjoins the municipalities of Manacor, Petra, Artà and Son Servera. Inland, the municipality contains the town centre of Sant Llorenç and the village of Son Carrió (es). On the coast, within the municipality, are Sa Coma, the northern part of s'Illot and the southern part of Cala Millor, which are all beachside tourist areas. The Punta de n'Amer (ca), a headland at the eastern end of the municipality, separates the beaches of Cala Millor and Sa Coma.
The Ma-15 (es), the main road from Palma, acts as a bypass around the southern and eastern sides of the town centre of Sant Llorenç, continuing north through Artà. The Ma-4030 road connects the town centre of Sant Llorenç with Son Servera, to the east. The Ma-4023 road is on an approximate north-south axis, parallel to the coast but about 1 mi (1.6 km) inland from the beach areas, connecting Son Servera with Porto Cristo.