Connors Bluff is a shore-entry reef site located in Gladstone Harbour. The site offers visibility reaching up to 20 metres, though conditions vary significantly due to exposure to rough weather and moderate currents, particularly on the eastern side of Curtis Island. Snorkellers and divers should exercise caution regarding sharp coral and the presence of jellyfish, with protective clothing recommended. Due to the potential for strong current pushes, it is essential to check local tide tables and plan activities around slack water. The site is accessible year-round, though water temperatures fluctuate between 20C and 28C throughout the year.

The eastern side of Curtis Island, located in Gladstone Harbour, is accessible primarily by boat. This site is subject to strong currents, which requires careful planning for both divers and snorkellers. Water temperatures at this location range from 20C in July to 28C during the summer months of January, February, and March. Given the current conditions, the site is better suited for experienced divers rather than beginners. Snorkelling is possible, though it receives a rating of 2/5 due to the challenging water movement. Visitors should be prepared for variable conditions throughout the year as they explore the marine environment of this coastal area.

Yellow Patch in Gladstone Harbour is a shallow seagrass site with a consistent depth of 4 metres. It serves as a sheltered anchorage, though tidal flow within the estuary can create currents. Visibility is typically 10 metres, providing clear conditions for observing the seagrass habitat. The site is accessible by boat and is suitable for beginners, though caution is advised regarding jellyfish and potential currents. Marine life in this region includes various reef fish and invertebrates that inhabit the seagrass beds. Always consult your boat operator regarding current conditions before entering the water, as these can change significantly.

Outer Rock is a reef and drop-off site located 48 kilometres offshore from Seventeen Seventy. The site reaches depths of 30 metres with an average depth of 22 metres. Access is by boat only, and the site is suited for intermediate divers. A moderate current is common, and conditions can change significantly based on tidal movement. Divers should exercise caution regarding strong currents and are advised to dive during slack water or high tide. The site features sharp coral and is known for the presence of bronze whaler and tiger sharks. Guided tours and boat charters are available for those planning a visit.