From the 1st of June until the 30th of September, the provinces of Barcelona, Girona, and Tarragona will participate in a Bioblitz called "BioMARató". The region that gets the most underwater observations, detects more invasive and rare species or gets the most participants will win. This event is part of the City Nature Challenge (CNC), an international friendly competition of naturalistic observations where cities worldwide will compete with each other. Participate on your own or sign up for one of the free activities on the Catalan coast (beaches in the Barcelona Metropolitan Area, Costa Daurada, and Costa Brava)