Angle (also dependent on time of day), air pollution, weather. And that’s only the “natural” part, most cameras will do auto-whitebalance, which doesn’t necessarily reflect the actual color of “white” at that moment.

In addition to the answers given, we also have the phenomenon of the “Mexican Filter”. Films and TV programmes featuring scenes in Central America and South East Asia often use extremely yellow / sepia colour grading.

While mostly employed as visual shorthand to show that the scenes are now somewhere other than Europe / North America, it’s so prevalent that people think the countries actually look like that.

Angle and atmospheric composition. Midday sun doesn’t always come at the same angle, because certain countries are closer to the equator. Also, pollution contributes to the color as well. Just look at some photos from China, and you’ll see what I mean. Natural phenomena like sand and ice can change the color too.

Then there’s also the fact that human eye+brain combo messes around with colors a whole lot. What you see (inside your head) is not exactly what’s on the outside of it. It’s reasonably close, but your brain does all sorts of tricks with the colors. That’s what some optical illusions are based on, and that’s why photography is so hard.

I’ve noticed other photos from my side of the country look similar to my own ones. I assume this is due to the light reflecting off the sea, the angle of the sun, and the cloud cover. The colour of the grass is also duller than many places.

Time of day and the photographers decisions in shooting and developing the photo (or lack of decisions in many cases) have a much bigger impact on this than where you are.

Second to that is probably local architecture, e.g. old town Marrakech will likely result in a redder tone photos than say a greek island, because a lot of the local building materials are going to be filtering out non red tones

The latitude and longitude, height above sea level, atmospheric stuff like particles, moisture, and everything else in the air affect how the sunlight gets filtered. It’s the same as the temperature being different in neighbouring cities or even neighbourhoods but generally on a larger scale. Most things have an effect, even stuff like what kinds of plants there are in different countries can have an effect. Imagine a building with lots of rooms in a line with windows. Everything from curtains, every piece of furniture, where in the building it is and how hot and dry the air is inside each room will affect the light inside that room. Same with cities, countries and continents. There are so many things that can affect it, so inevitably all things together will end up giving different results.