Gilboa Quarry is a 14-acre limestone site in the United States offering both shallow recreational areas and deep technical zones. Divers can explore various wrecks and artificial reefs throughout the quarry. Depths range from 2 to 140 metres, with an average depth of 14 metres. Entry is via the shore. Conditions include mild currents and visibility between 5 and 25 metres. Significant thermoclines exist, with surface temperatures reaching 24°C in summer and bottom temperatures dropping to 3-4°C. The site features extensive facilities including a dive shop, air fills, equipment rental, showers, and changing rooms. It is suitable for beginners, though divers should be prepared for cold water and potential entanglement hazards.

Portage Quarry is a freshwater dive site in the United States offering calm, controlled conditions suitable for beginner divers. The site features depths ranging from 12 to 18 metres with visibility typically between 5 and 15 metres. Divers enter directly from the shore. Water temperatures vary significantly, with a thermocline present in late May and surface temperatures reaching 20 to 26 degrees Celsius during the summer. The site is equipped with on-site facilities including a dive shop, air fills, parking, showers, toilets, and changing rooms. Guided tours are available for those who prefer assistance, and the site is well-suited for training dives or refresher sessions.