Where in the world is cycling most popular?

Could you tell me, where exactly in the world is cycling enjoyed the most? Are there any particular regions or countries that stand out as hotspots for cycling enthusiasts? I'm curious to know if there's a specific culture or lifestyle that fosters a love for cycling, and what factors contribute to its popularity in those areas. Perhaps it's the terrain, the weather conditions, or even government incentives that encourage people to hop on their bikes. It would be fascinating to delve into the reasons behind the surge in cycling popularity in certain parts of the world.