Physical geography
Bangladesh kind of fits into a little pocket of India, and so the two countries share borders on the west, north and east. Bangladesh borders Myanmar (Burma) in the south-east where there's a great huge beach. In case you're wondering what's to the south, it's the sea.
I read that most of Bangladesh is made up of flat plains, and when I got there I could see what they meant. You can see for miles in most places because there are no hills or tall buildings. The plains are only a few centimetres above sea level, and there are loads of rivers and streams running across them, so they can flood really easily. I was just lucky that it didn't happen whilst I was there. The farmers don't always see the floods as a bad thing because they bring fresh fertile soil to grow crops on. But when the floods get too high, or come at the wrong time of the year it can be a huge problem.
Bangladesh has a tropical monsoon climate. I was there in the cool season from November to February when the weather is a bit like British summertime. The hot season does what it says on the tin, and it can get sweltering. The rainy season is also well named, and between June and October over 4 metres of rain can fall (that's loads, measure it for yourself). Bangladesh is one of the wettest countries in the world. Between September and November is cyclone season, and that's when people really need to watch out because the weather can change so suddenly and floods are common.
Bangladesh is not all flat though. I went to Sylhet in the north-east and saw hills, huge forests and murky swamps. The Sundarbans area of Bangladesh has the largest mangrove swamps in the world; they cover 38,500 square kilometres! About 400 tigers live here, but I didn't manage to see a single one. Mind you, some might say I was lucky. I also heard that there are hills and jungle in the Chittagong (great name) region where elephants and bears live, but I never made it there.