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From Gifu! Hot Spring Museum Episode 15: Characteristics of Hot Springs in Gifu Prefecture

We have listed the number of hot spring sources by type for the 487 sources in Gifu Prefecture in Table 4, and a graph showing the number of sources by type in descending order in Figure 6 (as of the end of March 2004).

Table 4 Breakdown of 487 hot springs in Gifu Prefecture by type

Type of Hot Spring	Number of Sources	%
Simple Hot Spring	124	25.5
Alkaline Simple Hot Spring	43	8.8
Simple Carbon Dioxide Spring	3	0.6
Simple Sulfur Spring	33	6.8
Simple Iron Spring	6	1.2
Sodium Chloride Spring (Salt Spring)	34	7.0
Sodium Bicarbonate Spring (Baking Soda Spring)	96	19.7
Calcium Bicarbonate Spring (Bicarbonate Earth Spring)	7	1.4
Sodium Sulfate Spring (Glauber's Salt Spring)	4	0.8
Calcium Chloride Spring	5	1.0
Simple Radioactive Spring	84	17.2
Hot Springs Corresponding to Article 2 of the Hot Springs Act	28	5.7
Unanalyzed	20	4.1
Total	487	100.0

Data provided by Mr. Hiroshi Terao, Gifu Prefecture Institute of Health and Environmental Sciences

Figure 6 Breakdown of 487 hot springs in Gifu Prefecture by type

The most common type of hot spring in Gifu Prefecture is the Simple Hot Spring, accounting for about a quarter (25.5%) of the total. This is followed by Sodium Bicarbonate Spring (19.7%), Simple Radioactive Spring (17.2%), and Alkaline Simple Hot Spring (8.8%).
The "Hot Springs Corresponding to Article 2" in the table refers to hot springs that meet the definition of the Hot Springs Act and are recognized as "hot springs" but do not qualify as therapeutic springs.
Compared to the national frequency of hot spring types, the characteristics of hot springs in Gifu Prefecture include:

• A high proportion of radioactive springs
• A high proportion of sodium bicarbonate springs (baking soda springs)
• A low proportion of sodium chloride springs (salt springs)
• An extremely low proportion of sulfate springs
• No acidic springs

These are the characteristics that can be noted.