686.04 centimeters is equal to 269.92 inches.
This can be compared to the height of an average adult giraffe, which ranges from 18-20 feet or 216-240 inches. Therefore, 686.04 centimeters is roughly comparable to 1/4 to 1/3 of the height of an adult giraffe.
It is also close to the length of 1.5 tennis courts, which is 210 inches, or the length of a queen-sized bed, which is typically 235 inches.
In terms of every day objects, 686.04 centimeters is about the length of two standard doors placed end to end, which are typically 80 inches each.
Overall, 686.04 centimeters is a relatively long distance and is comparable to the length of several large objects.