Under the Sea party decoration ideas

Ocean streamers, bubble machines and a treasure dive.

Blue streamer "waves" from the ceiling
Treasure hunt in a paddling pool or sandpit
Bubble machine on the deck

Vibrant under the sea themed dessert table with ocean-inspired decorations and sweet treats — Photo: Vidal Balielo Jr.

Vibrant mermaid-themed first birthday party decoration with cake, balloons, and sweets — Photo: Karina Benfica

Assorted delicious sweets and desserts around tiered cake in theme of underwater flora and fauna — Photo: Jonathan Borba

Underwater-themed party table with mermaid and sea creature decorations — Photo: Vidal Balielo Jr.

Photos from Pexels, used under the Pexels License (free for commercial use). They show other families' parties for ideas only — TotBash is not affiliated with them.