Population: 230 million. Geography: diverse. Ethnic groups? Too many to mention. Welcome to Expatland - a place that's home to some five million Brits, six million Americans, one million Aussies and three million Germans, to name a few. This fictional nation is the creation of John Marcarian, an Australian expat for two decades whose book Expatland was launched this month. Marcarian, founder of CST Tax Advisors, coined the term after observing that a growing number of professional athletes, students, diplomats, hedge-fund managers, business owners, stay-at-home parents, etc, are seeking opportunity in a country other than their own. Marcarian's no-nonsense guide helps expats navigate the facets of life not often featured on Facebook feeds, online forums and Instagram accounts - mostly by telling them the right questions to ask. "Expats do social stuff well - the dinner parties, etc. What we don't do well is talking about the mistakes we've made," says Singapore-based Marcarian, who includes students and low-paid migrant workers in his definition of expat, and was in Hong Kong to promote his book. Included in Expatland are budget templates and guides to mortgages, taxes, health care, education, retirement, cultural differences and, perhaps most importantly, local laws - included is a rather scary example of an expatriate who was jailed for 10 years in Dubai for bribery. "I want to worry expats about the things they don't think about," says Marcarian. "And if I've saved someone from a pothole, that's my job done." Perhaps the most insightful chapter is "Expat Views from Expatland", where citizens of this brave new world answer questions such as "Has living in Expatland been a positive experience?" and "Did you make financial progress in Expatland?" Marcarian plans to make the book available in Putonghua, Spanish, German and French. The English version is available to order at www.expatland.com and costs A$39.95 (HK$250).