Tides Are Significant Only in Oceans and Large Seas—Not Lakes or Rivers

Tides result from the Moon's and Sun's gravitational pull on large, unconfined water bodies:

• Oceans & major seas: Clear high/low tides (Pacific, Atlantic, Mediterranean, etc.).
• Large lakes (Great Lakes, Baikal): Technically have tiny tides (<5 cm), masked by wind/seiche effects.
• Small lakes, rivers, ponds: No measurable tidal influence; water movement driven by flow, wind, pressure.

The gravitational force is too weak to overcome inertia in small volumes. Tides are an oceanic/large-sea phenomenon.