Hass made the remarks while visiting the historical township of Susa in Khuzestan.
The level of Swiss businessmen investment has doubled in Iran in recent years, the diplomat added.
He also voiced the Switzerland's readiness to expand all-out cooperation with Iran.
Haas added there is huge untapped potential in Iran which should be utilized properly.
During the past four years, the number of Swiss tourists, who have visited Iran, has increased from 5,000 to 15,000, he said, adding the two countries enjoy cordial relations in the fields of tourism industry.
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