For the Lingít people who have stewarded this land since time immemorial, observing and knowing the tides was necessary for survival in this region (Garza, 1999). The tides are so central to life in Southeast Alaska, that Lingít means tides people, or people of the tides (Garza, 1999). This set of lessons guides students in analyzing tidal data to recognize patterns and make conjectures about tides in this region. Throughout these ethnomathematics lessons students will make connections between the culture and place of Southeast Alaska and mathematics. These lessons are taught in a classroom, but would be a great introduction to tides before a beach field trip.