Scubahive
Scubahive
Scubahive
Scubahive

San Francisco

San Francisco officially the City and County of San Francisco, is a cultural, commercial, and financial center in the U.S. state of California. Located in Northern California, San Francisco is the 17th most populous city proper in the United States, and the fourth most populous in California, with 873,965 residents as of 2020.[15] It covers an area of about 46.9 square miles (121 square kilometers),[20] mostly at the north end of the San Francisco Peninsula in the San Francisco Bay Area, making it the second most densely populated large U.S. city, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. San Francisco is the 12th-largest metropolitan statistical area in the United States with 4.7 million residents, and the fourth-largest by economic output, with a GDP of $592 billion in 2019.[21] With San Jose, California, it forms the San Jose–San Francisco–Oakland, CA Combined Statistical Area, the fifth most populous combined statistical area in the United States, with 9.6 million residents as of 2019. Colloquial nicknames for San Francisco include SF, San Fran, The City, and Frisco

San Francisco

Stories, tips, and guides

Why Is the Water Along Peninsular Malaysia’s West Coast Green?

Green water along Peninsular Malaysia’s west coast is often assumed to mean pollution, but that is not always the case. Here’s a simple look at why it appears that way, what role plankton and water movement play, and why green water does not automatically mean a poor marine environment.

A Beginner’s Guide to Becoming a Scuba Diver

Thinking about learning to scuba dive? This beginner-friendly guide explains what certification involves, whether you need to be a strong swimmer, how safe diving really is, and what to expect from your first course.

What Is a Scuba Pointer and When Should You Use One?

A scuba pointer can be a useful tool for signalling, guiding attention, and managing certain dive conditions, but it is also easy to misuse. Here’s what new divers should know about when a pointer helps, when it does not, and how to use one responsibly.

6 Common Reasons Your Dive Mask Leaks

A leaking mask can turn an otherwise good dive into a distracting one. Here are six of the most common reasons dive masks leak, plus a few easy fixes to check before blaming the mask itself.

What Do Scuba Divers and Astronauts Have in Common? More Than You’d Think

Scuba divers and astronauts may explore opposite worlds, but they share more in common than most people realise. From neutral buoyancy training to life-support systems and pressure risks, here’s why the comparison is not as far-fetched as it sounds.

How to Avoid Risky Operators When Planning an Island or Dive Trip

Not every operator is equal, and price alone should never decide who you travel with. Here’s how to assess island, boat, and dive operators more carefully, and what warning signs travellers should never ignore.

The Ultimate Guide to Scuba Diving in Malaysia

Malaysia is one of Southeast Asia’s most diverse dive destinations, offering everything from iconic walls and pelagic action to macro hotspots, relaxed island diving, and accessible resort-based trips. This guide gives you a clear starting point for where to go, when to go, and what kind of diving to expect across the country.

Are Snow-Capped Reefs Real? What Coral Bleaching Actually Looks Like

A reef that looks white or “snow-capped” may seem beautiful at first glance, but it can be a warning sign of coral bleaching. Here’s what causes it, why it matters, and what divers and travellers can do to help protect coral reefs.

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