Best time to go
Oct to Apr
More reliable crossings and calmer seas; water often around 24°C to 28°C.
Main caution: Khareef monsoon brings rough seas and reduced visibility; offshore trips are frequently limited.

Expedition diving and Arabian Sea megafauna off Dhofar's wild island frontier
Updated Feb 13, 2026 • 20 sources
Overview
Hallaniyat Islands (also called Khuriya Muriya) are a remote Arabian Sea archipelago off Oman's Dhofar coast, reached via Salalah plus a long coastal drive and boat charter. In season (roughly October to May), divers come for expedition-style boat diving with low crowd levels, dramatic rocky reefs, and a real chance of big-animal encounters like the endangered Arabian Sea humpback whale population that stays in Omani waters year-round. Reef manta rays are also reported in the area, with seasonal aggregations. A Royal Decree in 2025 established the Hallaniyat Islands Marine Buffer Zone reserve, and the Environment Authority is expected to regulate access, fees, and permitted activities. Plan like an expedition: limited services, variable visibility, and weather that can change fast.
Royal Decree 96/2025 created the Hallaniyat Islands Marine Buffer Zone reserve, with detailed access rules and fees to be issued by the Environment Authority.
The Arabian Sea humpback whale subpopulation is rare and non-migratory; encounters are possible year-round in Omani waters, with strict responsible viewing practices recommended.
Most trips are liveaboard or multi-day charters with long crossings, limited infrastructure, and a real expedition vibe.
October to May is typically the workable offshore window for diving. June to September is Khareef in Dhofar: a prime topside season, but often challenging for offshore crossings.
Expedition Planning
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Quick shortlist before you jump into the full planning page.
Best time to go
Oct to Apr
More reliable crossings and calmer seas; water often around 24°C to 28°C.
Main caution: Khareef monsoon brings rough seas and reduced visibility; offshore trips are frequently limited.
DiveJourney destination guides are living documents built from local knowledge, operator experience, and publicly available sources. Conditions, regulations, and logistics can change. Each guide shows its last update date and sources used.
Last updated: February 13, 2026 • 20 sources
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