Which nation is a direct democracy ? (At the national scale)

Question

The direct democracy Wikipedia's page only talk about Switzerland. Is there any other nation that uses this system at the national level?

Edit 1:
In a direct democracy (DD), I mean a system in which the people really govern, and not just interfere with their representatives. Interfering isn't a characteristic of direct democracies, but of representative democracy (in such system the population doesn't govern but has merely the power to interfere with their elected rulers) [to interfere ≈ to bother, perturb, disturb].

In any representative democracy (RD), a certain percentage of the population (5-10% maybe, 99% definitely) has the power interfere ―even if it's not written clearly on the law/constitution (though, the smaller percentage, the more "representative" would be this democracy: a system that requires 1 millions of signature to launch a referendum is less democratic than a system that requires 1000).
So, to be clear, implementing "instruments of direct democracy" isn't enough: most (all?) RD do this (even in the worst dictatorship, a demonstration of several million people will have the power to interfere with the government).

This source states that the Swiss Confederation is [just] a semi-direct democracy because it's a "representative democracy with strong instruments of direct democracy". (Credit to Tilarion). But is Switzerland only a semi-direct democracy or really a direct democracy?

To answer this question we need first to answer this one: where to draw a line between representative democracy and direct democracy? With that answer, we could then find out which nation is a direct democracy. {1}

Edit 2:
Pommy's answer both questions:
- is Switzerland a direct democracy?
- where to draw a line between representative democracy and direct democracy?

According to Pommy's, Switzerland is a direct democracy because the popular vote is final and overrides the decisions of parliament (Direct democracy outdoes representative democracy).

Since we clarified what is (and isn't) a direct democracy, we can answer the question we started with:
Is there any other nation (than Switzerland) that uses this system at the national level?

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{1: But... a question has been asked here, How does direct democracy compare to representative democracy? but it remains vague, and the answers focus on whether direct democracy is better or worst than a representative democracy, which is not the point. Asking a new question will be probably closed as a duplicate. Let's try... }

Answer 1

Iceland seems to be one country is experimenting a form of direct democracy (source):

On its website the Constitutional Council proudly proclaims the new direct-democratic elements in the draft constitution as a major innovation:22 “With these changes, Iceland will be among the nations which best ensures the right of the public to participate in public decisions, or direct democracy.”

Articles 65 to 67 of the draft do indeed provide several participatory and direct democratic rights. For example, according to Art. 65, 10% of the electorate can launch a legislative initiative or call for an abrogative referendum on a law passed by parliament. As in the Swiss model, parliament can also present a counter-proposal, creating the space for a wider-ranging debate and avoiding ‘binary’ referendums - a simple choice between ‘yes’ and ‘no’ – as for example in California.

As a side note, this medium article offers some highlight about direct democracy in action within Iceland.

Baltic States also use a form of direct democracy according to this article:

From the end of 1980s the Baltic States: Estonia, Latvia and Lithuania successfully moved towards re-independence. At that stage referendums were a useful tool to carry through the transition peacefully. Today, each constitution of the Baltic Republics provides for instruments of direct democracy that have been used in different ways.

However, the same article concludes that direct democracy has several issues:

(..) referendums have been used strategically for partisan interest. The poor performance of direct democracy in the Baltic States to date is not only a result of strategic choices made by the authorities, but also of citizen-unfriendly procedural designs. In all three countries there are many formal constraints diminishing the will of the people.

Answer 2

Direct democracy in Switzerland overrides representative democracy

All major questions in Switzerland are decided by popular vote:

1. Any law adopted by parliament may be challenged by an optional referendum before it enters into force.
2. Changes to the constitution as well as major financial decisions are subject to a mandatory referendum.
3. Changes in other issues can be demanded in a constitutional initiative.

Parliament decides on the majority of laws, however the voting system brings the most important issues to popular votes. Parliament sometimes issues a voting recommendation or proposes an alternative, but the popular vote is final and overrides the decisions of parliament. This is more than just interference.

Switzerland thus has both forms of democracy, but direct democracy outdoes representative democracy.