Recent geological studies suggest that for millions of years the Amazon River used to flow in the opposite direction - from east to west. Eventually the Andes Mountains formed, blocking its flow to the Pacific Ocean, and causing it to switch directions to its current mouth in the Atlantic Ocean.

The Amazon River "ends" at the Atlantic Ocean because it follows a natural geological slope from west to east, discharging its massive volume of water into the sea. Interestingly, the river hasn't always ended there; millions of years ago, before the Andes Mountains rose, the river actually flowed in reverse from east to west, emptying into the Pacific Ocean. As the South American tectonic plate shifted and the Andes formed, a massive inland lake was created, which eventually overflowed toward the east, carving the path we see today. The river "ends" in a massive delta in northern Brazil that is so powerful it pumps fresh water dozens of miles out into the ocean, a phenomenon known as the "freshwater sea." The Amazon’s journey ends at the Atlantic because it is the lowest point of the continent’s drainage basin; gravity naturally pulls the water from the high-altitude headwaters in the Peruvian Andes through the rainforest until it reaches the global sea level. It is the world's largest river by discharge, accounting for nearly 20% of the total river water that enters the Earth's oceans.

Using a Suica card (or any major IC card) on a Kyoto City Bus in 2026 is straightforward but follows a specific "Tap" protocol. On most standard green Kyoto City Buses, you enter through the back door and exit through the front door. When you enter, you do not need to tap your card if it is a flat-fare zone (standard in the city center). However, when you are ready to get off, you must tap your card on the reader located next to the driver at the front exit. If the bus is a "Distance-Based" route (often seen heading toward Arashiyama or the outskirts), you must tap your card on the reader at the rear door when you enter to record your starting point, and then tap again at the front when you exit so the system can calculate the correct fare. The fare machine will display your remaining balance after the transaction. If your balance is low, you can ask the driver to "Charge" (Chaji) your card with cash while the bus is stopped, though it is much more polite to ensure your card is topped up before boarding to avoid delaying other passengers.