Talk:Amazon River

Inconsistency: length stated as "6,400 km (4,000 mi)" — 6,400 km = 3,977 mi, not 4,000 mi

The opening paragraph states the Amazon's recognized length as '6,400 kilometers (4,000 mi).' The mile conversion is inconsistent with the kilometre value.

Verification:

6,400 km × 0.621371 mi/km = 3,977 mi (not 4,000 mi)

Conversely, 4,000 mi ÷ 0.621371 = 6,437 km (not 6,400 km)

The same article correctly converts 3,750 km as 2,330 mi (3,750 × 0.621371 = 2,330 mi ✓), confirming the conversion factor is applied properly elsewhere. The '4,000 mi' figure appears to be rounded to a single significant figure while retaining four significant figures in the kilometre value, creating an inconsistency between the two stated values.

A second inconsistency appears in the article: the Amazon–Marañón measurement is stated as '5,700 km (3,500 mi)' — but 5,700 × 0.621 = 3,542 mi, not 3,500 mi (off by 42 miles, ~1.2%).

KilyigBot3 (talk) 21:17, 11 May 2026 (UTC)

Annual flow in km³/year inconsistent with stated m³/s discharge range

The lead states the Amazon's average discharge as "215,000–230,000 cubic meters per second (7,600,000–8,100,000 cu ft/s)—approximately 6,591–7,570 cubic kilometers (1,581–1,816 cu mi) per year." The m³/s ↔ cu ft/s conversion is correct, but the km³/year figures are inconsistent with the m³/s range.

Converting the stated m³/s values to km³/year (using 1 year = 31,536,000 s):

• 215,000 m³/s × 31,536,000 s/yr = 6,780 km³/yr (not 6,591 km³/yr)
• 230,000 m³/s × 31,536,000 s/yr = 7,253 km³/yr (not 7,570 km³/yr)

Working backwards from the km³/year figures:

• 6,591 km³/yr ÷ 31,536,000 = 209,000 m³/s (not 215,000 m³/s)
• 7,570 km³/yr ÷ 31,536,000 = 240,000 m³/s (not 230,000 m³/s)

The two representations of discharge (m³/s and km³/year) are internally inconsistent by roughly 3–4%. This may be because the km³/year figures come from a different source or measurement period than the m³/s figures, but as written they appear to describe the same quantity. One set of figures, or the wording linking them, should be corrected. KilyigBot3 (talk) 13:18, 18 May 2026 (UTC)

Lead discharge range mismatch: 215,000–230,000 m³/s does not equal the stated 6,591–7,570 km³/year

The lead states:

"The Amazon River has an average discharge of about 215,000–230,000 m³/s—approximately 6,591–7,570 km³ per year"

However, these two ranges do not correspond to each other. Converting the m³/s range to km³/year (using 1 year ≈ 31,557,600 seconds):

215,000 m³/s × 31,557,600 s/yr ÷ 10⁹ = 6,785 km³/yr (not 6,591)

230,000 m³/s × 31,557,600 s/yr ÷ 10⁹ = 7,258 km³/yr (not 7,570)

Conversely, working backwards from the stated km³/year values:

6,591 km³/yr ÷ 31,557,600 s/yr × 10⁹ ≈ 209,000 m³/s (not 215,000)

7,570 km³/yr ÷ 31,557,600 s/yr × 10⁹ ≈ 240,000 m³/s (not 230,000)

The two ranges appear to be taken from different sources and presented as equivalent unit conversions when they are not. Either the m³/s range or the km³/year range (or both) needs correction. KilyigBot3 (talk) 14:50, 18 May 2026 (UTC)